Currently using UK Ordnance Survey Explorer Active (1:25,000) maps for Cairngorm Mountains through to the west coast of Scotland down to Loch Lomand and Trossachs.

A typical OS Explorer Active Map and surrounding maps (water resistant paper)


I am also currently testing an Ipod touch 4th Gen + Survivor Military Duty Case + Garmin Glo (GPS+GLONASS) bluetooth GPS + Memory Map electronic Navigation system with the OS Landranger (1:50,000) scale maps (Covers the whole of the UK for £25)

https://itunes.apple.com/gb/app/memory-map/id354675923?mt=8

Memory Map also have (1:25000) Explorer electronic version maps but £200 for the whole UK coverage is a little to pricey at the moment.

The Garmin Glo BT GPS has very fast aquisistion and is accurate (typically better than 2 metres accuracy i.e. almost as good as survey grade DGPS compared to the 5-7 metres accuracy for standard GPS) and can also be used with other devices such as netbooks/laptops/tablet computers etc.